When Kate Exeter is kidnapped on the shore of the Thames, Commander William Monk is enlisted by her desperate husband to save her. Kate's captors are demanding a ransom for her safe return and Monk and his most trusted men must arrange a secret handover in the dark slums of Jacob's Island. But on the night someone betrays them and a brutal skirmish breaks out, leaving death and destruction in its wake . . .

Who is to blame for what went wrong? Monk senses tensions mount and no one knows who to trust. Then a whistle blower claims that the ransom money was embezzled funds that incriminate Kate's husband, and the case takes on a whole new meaning...